mirror of
https://github.com/torvalds/linux.git
synced 2024-12-23 19:31:53 +00:00
a0e27f51ba
A misspelled 'arbitrary' propagated to quite a few locations in the DT binding documentation for pin-controllers. Fixing by: git grep abitrary | cut -f1 -d: | xargs sed -i 's/abitrary/arbitrary/' Reported-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Rob Herring <robh@kernel.org>
144 lines
6.1 KiB
Plaintext
144 lines
6.1 KiB
Plaintext
NVIDIA Tegra20 pinmux controller
|
|
|
|
Required properties:
|
|
- compatible: "nvidia,tegra20-pinmux"
|
|
- reg: Should contain the register physical address and length for each of
|
|
the tri-state, mux, pull-up/down, and pad control register sets.
|
|
|
|
Please refer to pinctrl-bindings.txt in this directory for details of the
|
|
common pinctrl bindings used by client devices, including the meaning of the
|
|
phrase "pin configuration node".
|
|
|
|
Tegra's pin configuration nodes act as a container for an arbitrary number of
|
|
subnodes. Each of these subnodes represents some desired configuration for a
|
|
pin, a group, or a list of pins or groups. This configuration can include the
|
|
mux function to select on those pin(s)/group(s), and various pin configuration
|
|
parameters, such as pull-up, tristate, drive strength, etc.
|
|
|
|
The name of each subnode is not important; all subnodes should be enumerated
|
|
and processed purely based on their content.
|
|
|
|
Each subnode only affects those parameters that are explicitly listed. In
|
|
other words, a subnode that lists a mux function but no pin configuration
|
|
parameters implies no information about any pin configuration parameters.
|
|
Similarly, a pin subnode that describes a pullup parameter implies no
|
|
information about e.g. the mux function or tristate parameter. For this
|
|
reason, even seemingly boolean values are actually tristates in this binding:
|
|
unspecified, off, or on. Unspecified is represented as an absent property,
|
|
and off/on are represented as integer values 0 and 1.
|
|
|
|
Required subnode-properties:
|
|
- nvidia,pins : An array of strings. Each string contains the name of a pin or
|
|
group. Valid values for these names are listed below.
|
|
|
|
Optional subnode-properties:
|
|
- nvidia,function: A string containing the name of the function to mux to the
|
|
pin or group. Valid values for function names are listed below. See the Tegra
|
|
TRM to determine which are valid for each pin or group.
|
|
- nvidia,pull: Integer, representing the pull-down/up to apply to the pin.
|
|
0: none, 1: down, 2: up.
|
|
- nvidia,tristate: Integer.
|
|
0: drive, 1: tristate.
|
|
- nvidia,high-speed-mode: Integer. Enable high speed mode the pins.
|
|
0: no, 1: yes.
|
|
- nvidia,schmitt: Integer. Enables Schmitt Trigger on the input.
|
|
0: no, 1: yes.
|
|
- nvidia,low-power-mode: Integer. Valid values 0-3. 0 is least power, 3 is
|
|
most power. Controls the drive power or current. See "Low Power Mode"
|
|
or "LPMD1" and "LPMD0" in the Tegra TRM.
|
|
- nvidia,pull-down-strength: Integer. Controls drive strength. 0 is weakest.
|
|
The range of valid values depends on the pingroup. See "CAL_DRVDN" in the
|
|
Tegra TRM.
|
|
- nvidia,pull-up-strength: Integer. Controls drive strength. 0 is weakest.
|
|
The range of valid values depends on the pingroup. See "CAL_DRVUP" in the
|
|
Tegra TRM.
|
|
- nvidia,slew-rate-rising: Integer. Controls rising signal slew rate. 0 is
|
|
fastest. The range of valid values depends on the pingroup. See
|
|
"DRVDN_SLWR" in the Tegra TRM.
|
|
- nvidia,slew-rate-falling: Integer. Controls falling signal slew rate. 0 is
|
|
fastest. The range of valid values depends on the pingroup. See
|
|
"DRVUP_SLWF" in the Tegra TRM.
|
|
|
|
Note that many of these properties are only valid for certain specific pins
|
|
or groups. See the Tegra TRM and various pinmux spreadsheets for complete
|
|
details regarding which groups support which functionality. The Linux pinctrl
|
|
driver may also be a useful reference, since it consolidates, disambiguates,
|
|
and corrects data from all those sources.
|
|
|
|
Valid values for pin and group names are:
|
|
|
|
mux groups:
|
|
|
|
These all support nvidia,function, nvidia,tristate, and many support
|
|
nvidia,pull.
|
|
|
|
ata, atb, atc, atd, ate, cdev1, cdev2, crtp, csus, dap1, dap2, dap3, dap4,
|
|
ddc, dta, dtb, dtc, dtd, dte, dtf, gma, gmb, gmc, gmd, gme, gpu, gpu7,
|
|
gpv, hdint, i2cp, irrx, irtx, kbca, kbcb, kbcc, kbcd, kbce, kbcf, lcsn,
|
|
ld0, ld1, ld2, ld3, ld4, ld5, ld6, ld7, ld8, ld9, ld10, ld11, ld12, ld13,
|
|
ld14, ld15, ld16, ld17, ldc, ldi, lhp0, lhp1, lhp2, lhs, lm0, lm1, lpp,
|
|
lpw0, lpw1, lpw2, lsc0, lsc1, lsck, lsda, lsdi, lspi, lvp0, lvp1, lvs,
|
|
owc, pmc, pta, rm, sdb, sdc, sdd, sdio1, slxa, slxc, slxd, slxk, spdi,
|
|
spdo, spia, spib, spic, spid, spie, spif, spig, spih, uaa, uab, uac, uad,
|
|
uca, ucb, uda.
|
|
|
|
tristate groups:
|
|
|
|
These only support nvidia,pull.
|
|
|
|
ck32, ddrc, pmca, pmcb, pmcc, pmcd, pmce, xm2c, xm2d, ls, lc, ld17_0,
|
|
ld19_18, ld21_20, ld23_22.
|
|
|
|
drive groups:
|
|
|
|
With some exceptions, these support nvidia,high-speed-mode,
|
|
nvidia,schmitt, nvidia,low-power-mode, nvidia,pull-down-strength,
|
|
nvidia,pull-up-strength, nvidia,slew-rate-rising, nvidia,slew-rate-falling.
|
|
|
|
drive_ao1, drive_ao2, drive_at1, drive_at2, drive_cdev1, drive_cdev2,
|
|
drive_csus, drive_dap1, drive_dap2, drive_dap3, drive_dap4, drive_dbg,
|
|
drive_lcd1, drive_lcd2, drive_sdmmc2, drive_sdmmc3, drive_spi, drive_uaa,
|
|
drive_uab, drive_uart2, drive_uart3, drive_vi1, drive_vi2, drive_xm2a,
|
|
drive_xm2c, drive_xm2d, drive_xm2clk, drive_sdio1, drive_crt, drive_ddc,
|
|
drive_gma, drive_gmb, drive_gmc, drive_gmd, drive_gme, drive_owr,
|
|
drive_uda.
|
|
|
|
Valid values for nvidia,functions are:
|
|
|
|
ahb_clk, apb_clk, audio_sync, crt, dap1, dap2, dap3, dap4, dap5,
|
|
displaya, displayb, emc_test0_dll, emc_test1_dll, gmi, gmi_int,
|
|
hdmi, i2cp, i2c1, i2c2, i2c3, ide, irda, kbc, mio, mipi_hs, nand,
|
|
osc, owr, pcie, plla_out, pllc_out1, pllm_out1, pllp_out2, pllp_out3,
|
|
pllp_out4, pwm, pwr_intr, pwr_on, rsvd1, rsvd2, rsvd3, rsvd4, rtck,
|
|
sdio1, sdio2, sdio3, sdio4, sflash, spdif, spi1, spi2, spi2_alt,
|
|
spi3, spi4, trace, twc, uarta, uartb, uartc, uartd, uarte, ulpi,
|
|
vi, vi_sensor_clk, xio
|
|
|
|
Example:
|
|
|
|
pinctrl@70000000 {
|
|
compatible = "nvidia,tegra20-pinmux";
|
|
reg = < 0x70000014 0x10 /* Tri-state registers */
|
|
0x70000080 0x20 /* Mux registers */
|
|
0x700000a0 0x14 /* Pull-up/down registers */
|
|
0x70000868 0xa8 >; /* Pad control registers */
|
|
};
|
|
|
|
Example board file extract:
|
|
|
|
pinctrl@70000000 {
|
|
sdio4_default: sdio4_default {
|
|
atb {
|
|
nvidia,pins = "atb", "gma", "gme";
|
|
nvidia,function = "sdio4";
|
|
nvidia,pull = <0>;
|
|
nvidia,tristate = <0>;
|
|
};
|
|
};
|
|
};
|
|
|
|
sdhci@c8000600 {
|
|
pinctrl-names = "default";
|
|
pinctrl-0 = <&sdio4_default>;
|
|
};
|